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GIF format loads and saves color cycling data

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git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1599 416bcca6-2ee7-4201-b75f-2eb2f807beb1
This commit is contained in:
Yves Rizoud 2010-08-31 22:30:04 +00:00
parent 97060bc146
commit 838dd63a0c
1 changed files with 57 additions and 3 deletions
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60
src/fileformats.c
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@ -2011,6 +2011,47 @@ void Load_GIF(T_IO_Context * context)
}
}
}
else if (!memcmp(aeb,"CRNG\0\0\0\0" "1.0",0x0B))
{
// Color animation. Similar to a LBM CRNG chunk.
word rate;
word flags;
byte min_col;
byte max_col;
//
Read_byte(GIF_file,&size_to_read);
for(;size_to_read>0 && !File_error;size_to_read-=6)
{
if ( (Read_word_be(GIF_file,&rate))
&& (Read_word_be(GIF_file,&flags))
&& (Read_byte(GIF_file,&min_col))
&& (Read_byte(GIF_file,&max_col)))
{
if ((flags & 1) && min_col != max_col)
{
// Valid cycling range
if (max_col<min_col)
SWAP_BYTES(min_col,max_col)
context->Cycle_range[context->Color_cycles].Start=min_col;
context->Cycle_range[context->Color_cycles].End=max_col;
context->Cycle_range[context->Color_cycles].Inverse=(flags&2)?1:0;
context->Cycle_range[context->Color_cycles].Speed=rate/78;
context->Color_cycles++;
}
}
else
{
File_error=1;
}
}
// Read end-of-block delimiter
if (!File_error)
Read_byte(GIF_file,&size_to_read);
if (size_to_read!=0)
File_error=1;
}
else
{
// Unknown extension, skip.
@ -2349,9 +2390,6 @@ void Save_GIF(T_IO_Context * context)
{
// La palette a été correctement écrite.
// Le jour où on se servira des blocks d'extensions pour placer
// des commentaires, on le fera ici.
// Ecriture de la transparence
//Write_bytes(GIF_file,"\x21\xF9\x04\x01\x00\x00\xNN\x00",8);
@ -2367,6 +2405,22 @@ void Save_GIF(T_IO_Context * context)
Write_byte(GIF_file,strlen(context->Comment));
Write_bytes(GIF_file,context->Comment,strlen(context->Comment)+1);
}
// Write cycling colors
if (context->Color_cycles)
{
int i;
Write_bytes(GIF_file,"\x21\xff\x0B" "CRNG\0\0\0\0" "1.0",14);
Write_byte(GIF_file,context->Color_cycles*6);
for (i=0; i<context->Color_cycles; i++)
{
Write_word_be(LBM_file,context->Cycle_range[i].Speed*78); // Rate
Write_word_be(LBM_file,1|(context->Cycle_range[i].Inverse?2:0)); // Flags
Write_byte(LBM_file,context->Cycle_range[i].Start); // Min color
Write_byte(LBM_file,context->Cycle_range[i].End); // Max color
}
Write_byte(GIF_file,0);
}
// Loop on all layers
for (current_layer=0;